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21656 Knuth (1999 PX1)
Classification: Main-belt Asteroid          SPK-ID: 2021656
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2280377447054697 4.3805e-08  
a 2.708625743737407 1.3893e-08 au
q 2.090956837884353 1.1975e-07 au
i 9.259395622983643 4.5359e-06 deg
node 130.2331878184107 2.6832e-05 deg
peri 205.2216668444497 2.8073e-05 deg
M 326.8552169831705 1.036e-05 deg
tp 2459546.411382433310
(2021-Nov-27.91138243)
4.7215e-05 TDB
period 1628.253159738255
4.46
1.2527e-05
3.43e-08
d
yr
n .2210958399478068 1.7011e-09 deg/d
Q 3.326294649590461 1.7061e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1226  
   data-arc span      11240 days (30.77 yr)  
   first obs. used      1990-09-14  
   last obs. used      2021-06-23  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .5267  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 05:10:29  

Additional Information
 Earth MOID = 1.084 au 
 Jupiter MOID = 2.06066 au 
 T_jup = 3.308 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.62   n/a E2021B10  
diameter diameter 6.281 km 0.549 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.059   0.011 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21656 Knuth           Discovered 1999 Aug. 9 by P. Pravec and P. Kušnirák at Ondřejov.
Donald E. Knuth (b. 1938), professor of computer science at Stanford University, is author of The Art of Computer Programming, the fine typesetting system \TeX and the METAFONT system. \TeX has been used to produce a lot of the world's scientific literature in physics and mathematics, including the Minor Planet Circulars.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20010509/MPCPages.arcLast Updated: 2009-05-11

Alternate Designations
 1999 PX1 = 1990 SV16 = 1998 HZ140 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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